Optical disc apparatus and control method including an...

Details Optical disc apparatus and control method including an... Optical disc apparatus and control method including an...

2006-05-16

2010-11-30

Young, Wayne R (Department: 2627)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S044270, C369S044330

Reexamination Certificate

active

07843778

ABSTRACT:
An optical disc apparatus includes: a section for controlling an actuator by generating a voltage indication value indicative of a drive voltage applied to the actuator driving an objective lens; an section for periodically detecting the voltage indication value; a section for going into an excess detection mode when the voltage indication value outside a tolerable range is detected, and starting a re-detection period when the voltage indication value inside the tolerable range is detected, and remaining in the excess detection mode and extending the re-detection period when the voltage indication value outside the tolerable range is detected during the re-detection period, and stopping the excess detection mode when the voltage indication value outside the tolerable range is not detected again during the re-detection period; and an section for limiting the voltage indication value when staying in the excess detection mode for longer than a fail-safe action start period.

REFERENCES:
patent: 5184337 (1993-02-01), Rokutan
patent: 5519681 (1996-05-01), Maeda et al.
patent: 6834030 (2004-12-01), Kishimoto et al.

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